LC 1.1: Library of Congress (1800- )
LC 2.1: Humanities and Social Sciences Division
LC 3.1: Copyright Office (1897- )
LC 4.1: Manuscript Division (1897- )
LC 5.1: Geography and Map Division (1897- )
LC 6.1: Serial and Government Publications Division (1907- )
LC 7.1: Documents Division (1900-1943)
LC 8.1: Library Buildings and Grounds Superintendent (1897-1922)
LC 9.1: Acquisitions and Bibliographic Access Directorate (1940- )
LC 10.1: Law Library (1905-1981)
LC 11.1: Prints and Photographs Division (1921-1940)
LC 12.1: Music Division (1902-1940, 1949- )
LC 13.1: Accessions Division (1907-1943)
LC 14.1: Congressional Research Service (1914- )
LC 15.1: Aeronautics Division (1930-1940)
LC 16.1: Service for the Blind (1929-1936)
LC 17.1: Asian Division (1932- )
LC 18.1: Union Catalog Division (1936-?)
LC 19.1: National Library Service for the Blind and Physically Handicapped (1931- )
LC 20.1: Semitic Literature Division (1937-1939)
LC 21.1: State Law Index (1937-1939)
LC 22.1: Cooperative Cataloging and Classification Service (1934-1940)
LC 23.1: Rare Book and Special Collections Division (1938- )
LC 24.1: Hispanic Division (1940- )
LC 25.1: Prints and Photographs Division (1949- )
LC 26.1: Policy and Standards Division (1940- )
LC 27.1: Acquisitions Department (1943-1947)
LC 28.1: Card Division (1940)
LC 29.1: Reference Department (1944- )
LC 30.1: Library Services (1940- )
LC 31.1: European Affairs Division (1948-1952)
LC 32.1: Science and Technology Project (1948-1952)
LC 33.1: Science, Technology and Business Division (1952- )
LC 34.1: Stack and Reader Division (1954-?)
LC 35.1: European Division (1956- )
LC 36.1: Technical Information Division (1954-1961)
LC 37.1: Decimal Classification Office (1959- )
LC 38.1: Aerospace Technology Division (1965-1973)
LC 39.1: American Folklife Center (1976- )
LC 40.1: Motion Picture, Broadcasting, and Recorded Sound Division (1942- )
LC 41.1: African and Middle Eastern Division (1978- )
LC 42.1: Law Library (1981- )
LC 43.1: European Division
